Which term best describes a combination of air pollutants including smoke and fog?

The term that best describes a combination of air pollutants, specifically smoke and fog, is smog. Smog occurs when particulate matter from smoke combines with moisture in the atmosphere, resulting in a thick, often yellowish haze that can reduce visibility and harm respiratory health. This phenomenon is particularly prevalent in urban areas where industrial emissions, vehicle exhaust, and other pollutants can saturate the air, especially under certain weather conditions.

Traffic congestion relates to the buildup of vehicles that can indeed contribute to air pollution but does not specifically refer to a combination of air pollutants. Sanitation concerns the cleanliness of public spaces and waste management rather than the quality of air, while public transport pertains to the systems used for mass transportation in urban environments. Therefore, smog is the precise term that encapsulates the blending of smoke and fog as a significant environmental issue.